Finding the Fourth Proportional to 248,408.15, 372,667.50 and 90,636.55

Step by Step Solution

1. Step 1: Write the proportion equation
   248,408.15 : 372,667.50 = 90,636.55 : x
2. Step 2: Convert to fraction form
   248,408.15/372,667.50 = 90,636.55/x
3. Step 3: Cross multiply
   248,408.15x = 372,667.50 × 90,636.55
4. Step 4: Simplify right side
   248,408.15x = 33,777,295,565.46
5. Step 5: Solve for x
   x = 33,777,295,565.46/248,408.15
6. Step 6: Final answer
   x = 135,974.99